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18-09-2023 20:58 PM

XPS 9510, BIOS 1.22.0, I can no longer turn on my via U4021QW

After the update of latest BIOS 1.22.0 on my Dell XPS 9510 I can no longer turn on my computer via the power button on the Dell U4021QW monitor. I have to unplug the thunderbolt and plug it in again to turn on computer. 

This has been working fine in previous BIOS versions. 

I usually keep my computer in my laptop stand and I shutdown the computer via Windows 10, as normal. Then in the morning I have always just pressed the power button on the U4021QW and everything would start as normal. Computer turns on and a few seconds later the screen turns on. 

I now have to unplug laptop - turn it on - then plug i in again to get up and running. Just a bit annoying as this has been working great previously. 

2 Intern


4K Posts

20-09-2023 11:53 AM

Here are some steps you can take to troubleshoot the problem:

  1. Check the Connections:

    • Ensure that all cables connecting the external monitor to your laptop are securely plugged in.
    • Make sure the monitor is powered on and set to the correct input source.
  2. Try a Different Cable:

    • Sometimes, a faulty or incompatible cable can cause display issues. Try using a different cable to connect your laptop to the external monitor.
  3. Check Display Settings:

    • Right-click on your desktop and select "Display Settings."
    • Verify that the external monitor is recognized by your system and set as an extended display or the primary display, depending on your preference.
  4. BIOS and Driver Updates:

    • Ensure that your laptop's BIOS is up to date. You mentioned version 1.22.0, but newer versions may be available.
    • Update your graphics drivers to the latest version from the Dell website or the manufacturer's website (NVIDIA or AMD).
  5. Windows Power Options:

    • Sometimes, power-saving settings can affect external monitor behavior. Go to "Power & sleep settings" and adjust the power plan settings to ensure that your laptop doesn't turn off the display when idle.
  6. Restart and Test:

    • Restart your laptop with the external monitor connected, and see if the issue persists.
  7. Disconnect Other Peripherals:

    • Disconnect all unnecessary peripherals and USB devices from your laptop and try connecting the external monitor again.
  8. BIOS Settings:

    • Enter your laptop's BIOS settings (usually by pressing F2 or Del during startup).
    • Check for any display-related settings that might be affecting the external monitor. Ensure that the BIOS is set to allow external displays.
  9. Reset BIOS to Default:

    • In some cases, resetting the BIOS to default settings can resolve issues. Be cautious when doing this, as it may change other BIOS settings. Consult your laptop's manual for instructions on resetting the BIOS.
  10. Contact Dell Support:

    • If none of the above steps work, it's advisable to contact Dell support for further assistance. There may be a hardware issue or a specific compatibility problem that requires their expertise.

Before making any changes to BIOS settings or updating firmware, make sure to back up important data and proceed with caution. Incorrect BIOS settings can potentially cause further issues.